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Nineteenth century electric clocks
Electrical timepieces of the twentieth century
Electronically maintained mechanical timepieces
6 other sections not shown
Accutron amplifier amplitude applied armature atomic clock balance spring balance wheel bar magnet base current battery voltage bistable Bulova caesium Calibre E.S.A. capacitor cell changes collector current conductor connected constant current flows current pulse device diode direction disc display electric clocks electric field electric watch electrical circuit electrical contact electromagnet electronically maintained emitter energy level energy losses flux force friction gravity arm Hatot Horological Journal impulse coil increased induced voltage input integrated circuit liquid crystal magnetic field magnetic poles magnitude Marrison master clock mechanical clock mode motor move movement natural frequency nucleus operation orbit oscillatory system output patent pendulum arc pendulum clock piezoelectric effect plates position quartz clocks quartz oscillators quartz resonator quartz watch ratchet wheel resistance resistor result roller rotation rotor screw sensing coil shown in Figure silicon atoms standard stator switch temperature timekeeping transistor tuning fork Typical variation vibration voltage voltage induced zero zinc